A Crypt is needed to draw a Necromancer into the dungeon as a unit. That, and a pile of fresh bodies.
Within the Crypt are Soul Pyres, which allows a Necromancer to trap the souls of the bodies cast upon it. These souls can be used by the godless Necromancer to empower dead bodies with life once more, raising them as undead Ghouls shackled to his will. As the Necromancer’s army grows so too does his power, yet if vanquished the Ghouls will wander aimlessly unless a Necromancer of equal skill is able to chain them to his own command.
